Question

In C# - Provide code samples for the following: Declare a two-dimensional array of integers names intArray17. Create a loop to calculate the sum of every element in the first column. Create a loop to calculate the sum of every element in the array.

Answer 1

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using System;

public class Test
{
public static void Main()
{
int[,] intArray17 = new int[4, 2] { { 1, 2 }, { 3, 4 }, { 5, 6 }, { 7, 8 } };
int first_col_sum=0;
int total_sum=0;
for(int i = 0; i < 4; i++){
first_col_sum+=intArray17[i,0];
}
Console.WriteLine("sum of every element in the first column: "+first_col_sum);
  
for(int i = 0; i < 4; i++){
for(int j=0;j<2;j++){
total_sum+=intArray17[i,j];
}
}
Console.WriteLine("Sum of every element in the array: "+total_sum);
  
}
}

Code and output: